For many students, mathematics is an abstract thought and logic that pains minds。
A "ghost" teacher makes 17 cool mathematical dynamics that make math clear
The law of equity
The squares of the two straight-angle triangles and the squares equal to the slopes, for many, a2+b2=c2 is just a bunch of symbols. In practice, however, this formula can also be expressed as two squares of squares with a length of a straight angle equal to the square of squares with a length of a tilt。
2. How to draw a perfect ellipse
Ellipse is defined as the trajectory to the distance between the two fixed points and the point that remains unchanged. This can be expressed in very intuitive graphics: a string, both ends pinned together, and a curve formed by a moving pen is an elliptical after a pen is applied。
3. Surface area of the cylinder
The surface area of various stereogeometric graphics is a headache and a difficult memory. In fact, the surface area is just the sum of the size of the graphics after they have been expanded。
Area of round
We all know the size formula of the circle, but how many people know how it was recovered? Here is one of the very intuitive, very intuitive solutions。
5. Relationship between sine and cosine functions
There is a very close relationship between the sin and cos functions. There are also a large number of conversion formulas between the two, as well as those derived from them. In fact, the relationship between the two can be expressed very intuitively in a circle. In fact, there is also a need for a very intuitive understanding of the relationship between complex mathematical changes, such as that of the fouriers。
6. Outer angle of polygon and 360 degrees
The theorem can prove that there are many methods of resolution, but there are more methods of resolution that can be seen and felt directly。
Volume of cones
The volume of a cone is one third of the volume of the cylindrical area. This is evident in the figure。
8 lehman appeals for peace
Lehman uses the area of the rectangular with different widths and the area that comes close to seeking to capture the irregular curve, and when the rectangular width is approaching infinity, it is a modern calculus formula. The image shows the difference between the size sought and the area below the true curve in different widths。
Intuitive explanation of the pi
We all know that pi has something to do with the circle, and here's a very intuitive explanation。
10. Drawing methods for parabolic lines
Taking a point on a vertical axis is a parabolic line in all the tracks that make up the point at this point and the point at the same distance between the points with the vertical cross-coordinates。
11. Display sine, cosine space
12. Fractal
13. Heart line
14. Movement of straight lines on hyperbolic sides
Positive, cosine-triangular functions
16. Remove the digits of this number in order from left to right
The numbers left are still prime
Use of "foil" easy solution binary multiplication
Infinite squares
19. Visualization of matrix conversions
20. A special crossline between the plane and the circle:
Willarceau circles
21. Normal visualization
22. Gaussian scale graph 17 sides
